In a handheld mobile phone (10) having a detachable battery pack (20) which can be removably mounted to a body (11) of the handheld mobile phone, the detachable battery pack has a memory card receiving recess (22) for removably receiving a body of a memory card (30), and the body of the handheld mobile phone has a plurality of contacts (15) which are brought into electrical contact with contact terminals (31) of the memory card mounted to the detachable battery pack when the detachable battery pack is mounted to the body of the handheld mobile phone.